chore: improve changelog (fixes #93) (#94)

Author: dominikg

.changeset/happy-mails-kneel.md

@@ -0,0 +1,5 @@
+---
+'@sveltejs/vite-plugin-svelte': patch
+---
+
+further improvements to changelog (see #93)

scripts/changelog-github-custom.js

@@ -2,6 +2,8 @@
 // modifications to improve readability:
 // - removed thanks notes. We're thanking contributors in the PRs or acknowledge their work in different ways
 // - moved issue links to end of first line
+// - omit link to merge commit if PR link is found
+// - linkify issue hints like (see #123) or (fixes #567)
 
 const { config } = require('dotenv');
 const { getInfo, getInfoFromPullRequest } = require('@changesets/get-github-info');
@@ -66,7 +68,14 @@ const changelogFunctions = {
 			})
 			.trim();
 
-		const [firstLine, ...futureLines] = replacedChangelog.split('\n').map((l) => l.trimRight());
+		// add links to issue hints (fix #123) => (fix [#123](https://....))
+		const linkifyIssueHints = (line) =>
+			line.replace(/(?<=\( ?(?:fix|fixes|see) )(#\d+)(?= ?\))/g, (issueHash) => {
+				return `[${issueHash}](https://github.com/${options.repo}/issue/${issueHash.substring(1)})`;
+			});
+		const [firstLine, ...futureLines] = replacedChangelog
+			.split('\n')
+			.map((l) => linkifyIssueHints(l.trimRight()));
 
 		const links = await (async () => {
 			if (prFromSummary !== undefined) {
@@ -97,10 +106,8 @@ const changelogFunctions = {
 			};
 		})();
 
-		const suffix = [
-			links.pull === null ? '' : ` (${links.pull})`,
-			links.commit === null ? '' : ` (${links.commit})`
-		].join('');
+		// only link PR or merge commit not both
+		const suffix = links.pull ? ` (${links.pull})` : links.commit ? ` (${links.commit})` : '';
 
 		return `\n\n- ${firstLine}${suffix}\n${futureLines.map((l) => `  ${l}`).join('\n')}`;
 	}